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.\" Copyright (c) 2016 John Baldwin <jhb@FreeBSD.org>
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.Dd November 24, 2017
.Dt sysdecode_fcntl_arg 3
.Os
.Sh NAME
.Nm sysdecode_fcntl_arg ,
.Nm sysdecode_fcntl_arg_p
.Nd output description of fcntl argument
.Sh LIBRARY
.Lb libsysdecode
.Sh SYNOPSIS
.In sysdecode.h
.Ft void
.Fn sysdecode_fcntl_arg "FILE *fp" "int cmd" "uintptr_t arg" "int base"
.Ft bool
.Fn sysdecode_fcntl_arg_p "int cmd"
.Sh DESCRIPTION
The
.Fn sysdecode_fcntl_arg
function outputs a text description of the optional
.Fa arg
argument to
.Xr fcntl 2
to the stream
.Fa fp .
The type and format of
.Fa arg
are determined by
.Fa cmd :
.Bl -column ".Dv F_SETLKW" "Vt struct flock *"
.It Sy Command Ta Fa arg Sy Type Ta Sy Output Format
.It
.It Dv F_SETFD Ta Vt int Ta
.Dq FD_CLOEXEC ,
.Dq FD_CLOFORK
or the value of
.Fa arg
in the indicated
.Fa base
.Pq one of 8, 10, or 16 .
.It
.It Dv F_SETFL Ta Vt int Ta
File flags as output by
.Xr sysdecode_fcntl_fileflags 3
with any unknown or remaining bits output in hexadecimal.
.It
.It Dv F_GETLK Ta Vt struct flock * Ta
.It Dv F_SETLK Ta Vt struct flock * Ta
.It Dv F_SETLKW Ta Vt struct flock * Ta
The value of
.Fa arg
using the
.Dq %p
conversion specification.
.It
.It Others Ta Vt int Ta
The value of
.Fa arg
in the indicated
.Fa base
.Pq one of 8, 10, or 16 .
.El
.Pp
The
.Fn sysdecode_fcntl_arg_p
function can be used to determine if a
.Xr fcntl 2
command uses the optional third argument to
.Xr fcntl 2 .
The function returns
.Dv true
if
.Fa cmd
accepts a third argument to
.Xr fcntl 2
and
.Dv false
if it does not.
.Sh RETURN VALUES
The
.Nm sysdecode_fcntl_arg_p
function returns
.Dv true
if
.Fa cmd
accepts a third argument to
.Xr fcntl 2
and
.Dv false
if it does not.
.Sh SEE ALSO
.Xr sysdecode 3 ,
.Xr sysdecode_fcntl_cmd 3 ,
.Xr sysdecode_fcntl_fileflags 3
